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@tallsam
Fucking bollocks. I can't figure it out.
I lined up the H & L screws of the Rear DR and thats all well. Still jumps.
Adjusted the barrel adjuster a bit and its still jumping.
I figured it may be that the chain was too long (too much slack means the spring arm isn't tense enough and in theory the chain could jump about a bit) so I took out another two links (I can't remove any more links from the chain or it won't go into big cog front and big at back). The B tension screw is pretty tight so its not that.
Fuck knows. Looks like a job for the LBS. Thing is they'll probably just tell me to replace all that shit which is way too expensive for the bike (cost me $75 AUS - I've already spent $25 replacing a spoke and $35 on a new chain).
I should've just got a new bike.
If I didn't have biopace rings I'd just remove the gears and shorten the chain so it's a cheapo single speed.